MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 8b285bfafb3e876e29f04165896276d17f0998e2b02f97c90a28c34ab53ee866. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


QuasarRAT


Vendor detections: 14


Intelligence 14 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 8b285bfafb3e876e29f04165896276d17f0998e2b02f97c90a28c34ab53ee866
SHA3-384 hash: e1a8f3d3540f9b386fc55b07d1d1a5936222bbe1e42fd174c1633fba7b9b6c8848671070415cd31d2f11625903d422ea
SHA1 hash: 0b8350f2209d6d685e7ec9e560a0dbb9a64be0b4
MD5 hash: 34bb85c8ea2a26c6ca3fc3a7e837446e
humanhash: cup-pluto-sodium-pennsylvania
File name:WindowsUpdateSvc.bat
Download: download sample
Signature QuasarRAT
Create hunting rule
File size:3'377'565 bytes
First seen:2025-12-16 21:48:53 UTC
Last seen:Never
File type:Batch (bat) bat
MIME type:text/x-msdos-batch
ssdeep 49152:BaRos578wMXShap0xicL7EQQQ4UvnrISqeQan13U46/tUh:M
Threatray 54 similar samples on MalwareBazaar
TLSH T1BCF533115F2D4C7F0E6C4759622A5F1E57E4CFC1CDACC4F892B638CA219FB86904B8A9
Magika batch
Reporter smica83
Tags:bat QuasarRAT

Intelligence

File Origin
# of uploads :
1
# of downloads :
64
Origin country :
HU HU
Vendor Threat Intelligence
No detections
Malware family:
n/a
ID:
1
File name:
WindowsUpdateSvc.bat
Verdict:
Malicious activity
Analysis date:
2025-12-16 21:50:43 UTC
Tags:
auto-reg evasion crypto-regex pulsar rat
Link:
https://app.any.run/tasks/64c01803-d597-45e6-9fd5-0470180440fb

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/45281/
Verdict:
Malicious
Score:
94.9%
Link:
https://cyber-fortress.com/docs/result/index.php?id=6941d3e24d2b81828c3b59a9
Tags:
autorun micro shell sage
Result
Verdict:
Malware
Maliciousness:

Behaviour
Launching a process
Creating a file
Enabling the 'hidden' option for recently created files
Creating a file in the %temp% subdirectories
Creating a process with a hidden window
Creating a window
Сreating synchronization primitives
Connection attempt
DNS request
Sending a custom TCP request
Using the Windows Management Instrumentation requests
Creating a file in the %AppData% subdirectories
Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch
Enabling autorun by creating a file
Verdict:
Suspicious
Threat level:
  5/10
Confidence:
100%
Tags:
obfuscated
Link:
https://www.filescan.io/uploads/6941d3dae126b9ff438391cf/reports/4d7f83b3-b872-41b9-ba2f-82dbadfa4214/overview
Verdict:
Unknown
Link:
https://www.hybrid-analysis.com/sample/8b285bfafb3e876e29f04165896276d17f0998e2b02f97c90a28c34ab53ee866
Verdict:
Malicious
File Type:
unix shell
First seen:
2025-12-16T19:18:00Z UTC
Last seen:
2025-12-16T19:46:00Z UTC
Hits:
~10
Detections:
HEUR:Trojan.PowerShell.Tesre.sb Backdoor.MSIL.Cardinal.sb Trojan.Win64.DonutInjector.sb BSS:Trojan.Win32.Generic Trojan-PSW.Win32.Xploder.sb Trojan.Win32.Vimditator.sb BSS:Trojan.Win32.Generic.nblk Trojan.Win64.Donut.sb Trojan.Win32.Agent.sb Trojan.MSIL.Agent.sb Trojan.BAT.Agent.sb HEUR:Trojan.MSIL.Rozena.gen Backdoor.MSIL.PulsarRAT.sb Trojan-PSW.MSIL.Agent.sb HEUR:Trojan.BAT.Tesre.gen Trojan-Dropper.PowerShell.Obfus.sb Trojan.Win32.Shellcode.sb
Link:
https://opentip.kaspersky.com/8b285bfafb3e876e29f04165896276d17f0998e2b02f97c90a28c34ab53ee866/results?tab=lookup
Result
Threat name:
DonutLoader, Quasar
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1834396
Signature
Antivirus detection for dropped file
Bypasses PowerShell execution policy
Found large BAT file
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Installs new ROOT certificates
Joe Sandbox ML detected suspicious sample
Malicious sample detected (through community Yara rule)
Sample uses string decryption to hide its real strings
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: Dot net compiler compiles file from suspicious location
Sigma detected: Potentially Suspicious PowerShell Child Processes
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: PowerShell Base64 Encoded IEX Cmdlet
Sigma detected: Schedule system process
Suspicious powershell command line found
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Unusual module load detection (module proxying)
Uses attrib.exe to hide files
Uses cmd line tools excessively to alter registry or file data
Uses schtasks.exe or at.exe to add and modify task schedules
Yara detected AntiVM3
Yara detected DonutLoader
Yara detected Quasar RAT
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 1834396 Sample: WindowsUpdateSvc.bat Startdate: 16/12/2025 Architecture: WINDOWS Score: 100 66 ipwho.is 2->66 72 Found malware configuration 2->72 74 Malicious sample detected (through community Yara rule) 2->74 76 Antivirus detection for dropped file 2->76 78 12 other signatures 2->78 9 cmd.exe 4 2->9         started        13 cmd.exe 1 2->13         started        15 cmd.exe 2->15         started        17 powershell.exe 27 2->17         started        signatures3 process4 file5 62 C:\...\WindowsUpdateSvc.bat:Zone.Identifier, ASCII 9->62 dropped 64 C:\Users\user\...\WindowsUpdateSvc.bat, DOS 9->64 dropped 90 Suspicious powershell command line found 9->90 92 Uses cmd line tools excessively to alter registry or file data 9->92 94 Bypasses PowerShell execution policy 9->94 96 Uses attrib.exe to hide files 9->96 19 powershell.exe 14 51 9->19         started        23 powershell.exe 7 9->23         started        33 4 other processes 9->33 25 powershell.exe 23 13->25         started        27 conhost.exe 13->27         started        35 4 other processes 13->35 29 powershell.exe 15->29         started        37 5 other processes 15->37 31 conhost.exe 17->31         started        signatures6 process7 dnsIp8 68 208.91.189.89, 4782, 49690, 49699 TAMCLOUDUS United States 19->68 70 ipwho.is 15.204.213.5, 443, 49691 HP-INTERNET-ASUS United States 19->70 80 Installs new ROOT certificates 19->80 82 Tries to detect sandboxes and other dynamic analysis tools (process name or module or function) 19->82 84 Hides that the sample has been downloaded from the Internet (zone.identifier) 19->84 39 csc.exe 3 19->39         started        42 schtasks.exe 1 19->42         started        86 Uses schtasks.exe or at.exe to add and modify task schedules 23->86 88 Unusual module load detection (module proxying) 23->88 44 csc.exe 3 25->44         started        46 csc.exe 29->46         started        signatures9 process10 file11 56 C:\Users\user\AppData\Local\...\qkk11kdo.dll, PE32 39->56 dropped 48 cvtres.exe 1 39->48         started        50 conhost.exe 42->50         started        58 C:\Users\user\AppData\Local\...\0monkzwm.dll, PE32 44->58 dropped 52 cvtres.exe 1 44->52         started        60 C:\Users\user\AppData\Local\...\mm2im5qt.dll, PE32 46->60 dropped 54 cvtres.exe 46->54         started        process12
Score:
99%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/8b285bfafb3e876e29f04165896276d17f0998e2b02f97c90a28c34ab53ee866
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/8b285bfafb3e876e29f04165896276d17f0998e2b02f97c90a28c34ab53ee866/
Verdict:
Malicious
Threat:
Family.PULSAR
Link:
https://tip.neiki.dev/file/8b285bfafb3e876e29f04165896276d17f0998e2b02f97c90a28c34ab53ee866
Threat name:
Win32.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2025-12-16 19:27:20 UTC
File Type:
Text (Batch)
AV detection:
5 of 24 (20.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=rmufx6x3h2dw4kpqifsysytw2f7qtghcwaxzpsikfdbuvnj65bta._file
Verdict:
malicious
Label(s):
quasarrat
Create hunting rule
donutloader
Create hunting rule
Similar samples:
0455ebce0a62e2413a730a8e172cde5e6171d2a3569c4620c7e10a6ff04a3710
QuasarRAT
0b5c1b777491d7f267bdb5b1eb6e687323799f85ea5eac44f3db11a84c7f505c
QuasarRAT
15119331f58db1c391df927fa73723c1d7ba66d46fe2aecf1526a117c5b59d05
QuasarRAT
5796230cdd9dac9064551b7e0aeecd62ff2c25808dfe854e774c54815f66c741
QuasarRAT
6eeb5788ce02a71cee8cad314c4f1c467ac0dc77b23cbbef4f3a38bdfbd75f46
QuasarRAT
7830e7c10b53bf790efd4c6b5d52e0c31cb83d86378c2aeef96d7dc8d726f245
QuasarRAT
9250584a4878cae6188ba7eafa667e4612afbfb89e2698bbc5ceb7fa17cddc08
QuasarRAT
e27288fcd6c3ccbadf90d37481ff6b407e31eeb33f775e5110be3e75401879b9
QuasarRAT
error
QuasarRAT
+ 44 additional samples on MalwareBazaar
Result
Malware family:
quasar
Create hunting rule
Score:
  10/10
Tags:
family:donutloader family:quasar defense_evasion execution loader persistence spyware trojan
Link:
https://tria.ge/reports/251216-1pfcysex2e/
Behaviour
Scheduled Task/Job: Scheduled Task
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of WriteProcessMemory
Uses Task Scheduler COM API
Views/modifies file attributes
Adds Run key to start application
Badlisted process makes network request
Command and Scripting Interpreter: PowerShell
Detects DonutLoader
DonutLoader
Donutloader family
Quasar RAT
Quasar family
Quasar payload
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/8b285bfafb3e876e29f04165896276d17f0998e2b02f97c90a28c34ab53ee866

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:CP_Script_Inject_Detector
Create hunting rule
Author:DiegoAnalytics
Description:Detects attempts to inject code into another process across PE, ELF, Mach-O binaries
Rule name:Disable_Defender
Create hunting rule
Author:iam-py-test
Description:Detect files disabling or modifying Windows Defender, Windows Firewall, or Microsoft Smartscreen
Rule name:Sus_CMD_Powershell_Usage
Create hunting rule
Author:XiAnzheng
Description:May Contain(Obfuscated or no) Powershell or CMD Command that can be abused by threat actor(can create FP)

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Cape
Cape
https://www.capesandbox.com/analysis/45281/

Comments